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USING THE TACHYMETER
The most common use of a tachymeter is for
measuring the approximate speed of a vehicle over a
known distance.
(e.g.) Based on how many seconds it takes a
vehicle to travel 1km or 1 mile (the available
measuring range is up to 60 seconds), the average
speed within the distance can be calculated.
1. Start the chronograph when the vehicles
commence travel.
2. After the vehicle has travelled
1 km/1mile, stop the chronograph.
STOPWATCH
SECOND HAND
The approximate average speed within the distance
can be determined by observing the present position
of the second hand and reading the outer bezel.
Note: The tachymeter indications may appear on
dial ring, rather than on the outer bezel (depending
on model).
As shown in the illustration, it takes the vehicle 45
seconds to travel 1km so the approximate average
speed is 80kph (50 mph).
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